drzt02.f3

Usage

Functions/Subroutines

double precision function drzt02 (m, n, af, lda, tau, work, lwork)
DRZT02

Function/Subroutine Documentation

double precision function drzt02 (integer m, integer n, double precision, dimension( lda, * ) af, integer lda, double precision, dimension( * ) tau, double precision, dimension( lwork ) work, integer lwork)

DRZT02

Purpose:

!>
!> DRZT02 returns
!>      || I - Q'*Q || / ( M * eps)
!> where the matrix Q is defined by the Householder transformations
!> generated by DTZRZF.
!>

Parameters

!>          M is INTEGER
!>          The number of rows of the matrix AF.
!>

!>          N is INTEGER
!>          The number of columns of the matrix AF.
!>

!>          AF is DOUBLE PRECISION array, dimension (LDA,N)
!>          The output of DTZRZF.
!>

LDA

!>          LDA is INTEGER
!>          The leading dimension of the array AF.
!>

TAU

!>          TAU is DOUBLE PRECISION array, dimension (M)
!>          Details of the Householder transformations as returned by
!>          DTZRZF.
!>

WORK

!>          WORK is DOUBLE PRECISION array, dimension (LWORK)
!>

LWORK

!>          LWORK is INTEGER
!>          length of WORK array. LWORK >= N*N+N*NB.
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 89 of file drzt02.f.